Orange to red tetrazo dye and process of making same.



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STATE PATENT ARNOLD SCHEDLER, 0F BAS EL, SWITZERLAND, ASSIGNOR TO INDUSTRY IN BASLE, OF BASEL, SWITZERLAND.

ORANGE TO RED TETRAZO DYE AND PROCESS OF MAKING- SAME.

To all "whom it may concern:

Specification of Letters Patent.

Be it known that I, ARNOLD SCHEDLERM chemist and Switzerland, have invented new and useful Orange to Red Tetrazo Dyestufl's and a Procof Making Same, of which the following is a full, clear, and exact specification.

I have found that new valuable tetrazo dyestutl's adapted to be further diazotized either in mass or on the fiber are obtained by combining either two molecular proportions of an amido-aryl-3-methyl-5-pyrazolone or of an amido-aryl-5-pyrazolone-3-carboxylic acid, or, in any order, one molecular proportion of one of these compounds and one molecular proportion of another suitable azo-dyestuif component, with a tetrazo-compound derived from a diamin of the general constitution in which X represents- 0, s, on=cn NH.CO-. N"=N,

and R R represents the same or different aryl residues; examples of such diamins are a. diamidodiphenyl ether, a thioanilin, an azoanilin, an azoxy-anilin, paraamidophenolet-hylene ether, a para-para-diamido-diphenylureadisulfonic acid, metaamidobenzoyl meta phenylenediamin. The dyestufis thus obtained form, in dry state, brownish-yellow to brown powders and dye cotton orange-yellow to red tints which when diazotized on the fiber and subsequently developed with suitable azo-dyestufl' components, as for instance methylphenylpyrazolone or ,B-naphthol, are transformed into fiery reddish yellow and orange to blue red tints of excellent fastness to washing.

Example 1: 6,4 parts of meta-az0xy-to luidin (made from para-nitroortho-toluidin) are dissolved in 100 parts of hot water with addition of 15 parts of hydrochloric acid of 30 per cent. strength and the solution is cooled to 0 C. The solution is next diazotized with 3,6 parts of sodium nitrite and the tetrazo-solution is run into an ice-cold solution of 11 parts of meta-amidophenol-5- doctor of philosophy, a citizen i of the Swiss Republic and resident of Basel,

Patented net. is, race.

Application filed July 7, 1909. Serial No. 506,275.

pyrazolone-3-carboxylic acid and 20 part-s of The formation calcined sodium carbonate. of dyestufl' is complete after a shorttime, whereupon the yellow product which has separated is filtered OK and dried. It dyes I cotton directly reddish yellow tints which pass to a clear orange when diazotized on the fiber and subsequently developed with [i-naphthol, the dyeings being excellently fast to washing. By substituting phenyl-methylpyrazolone for the ,B-naphthol, a clear reddish yellow fast to washing is obtained.

Example 2: 3,14 parts of para-amidophenol-ethylene ether (hydrochlorid),

are dissolved in about 50 parts of hot water, the cooled solution is mixed with 5 parts of hydrochloric acid of 30 per cent. strength and then diazotized by means of 1,4 parts of sodium nitrite. The tetrazo-solution thus obtained is run into a solution of 4,8 parts of meta amido phenyl 5 pyrazolone 8 carboxylic acid and 8 parts of calcined sodium carbonate in about 100 parts of water. When the combination is complete the dyestuit is worked up in the usual manner. It dyes cotton without a mordant yellow tinged orange tints, which when diazotized and developed with ,8-naphthol pass to a red orange fast to washing.

Example 3: at parts of para-para-diamidodiphenyl-urea-meta-meta-disulfonic acid are dissolved in 50 parts of water with addition of the necessary quantity of sodium carbonate; after cooling to 540? L.-the solution is diazotized by means of 8 parts of hydrochloric acid and 1,4 parts of sodium nitrite. The tetrazo-solution is then stirred into a solution of 4 parts of meta-amidophenyl-3-methyl-5-pyrazolone made alkaline with sodium carbonate. The dyestutt, isolatedby salting out and filtering, dyes cotton yellow orange. The dyeings developed with ,G-naphthol exhibit a .red orange tint of great clarity and excellent fastness to washingi,

Xample 4-: For the urea-deriVatn-e used in the preceding example is substituted the equivalent quantity (4,1-1 parts) of para para diamidostilbene-ortho-ortho-disnlfonic acid. There is thus obtained a dyestuit SOCIETY OF CHEMICAL which dyes cotton directly yellow red, the

] dyeings developed -with ,B-naphthol being carbonate.

clear blue-red.

Example 5: The tetrazo-solution made in the usual manner from 5,7 parts of metaazoxyanilin is neutralized with sodium carbonate and mixed with an ice-cold solution of 8 parts of 2:5-amino-naphthol-1:7-disul fonic acid and 20 parts-ofcalcined sodium When the formation of the intermediate product is complete, a solution of 5,5 parts of metaamino-phenyl-5-pyrazolone-3-carboxylic acid is added and the mixture is stirred for some time; the mass is then warmed and thedyestuff salted out.

1t dyes cotton yellow orange tints which,

when developed with B-naphthol pass to a clear deep scarlet.

In an analogous manner dyestuffs may be made from other diamins included in the Instead of the first component named in Example 5 another azodyestuff component may be used; particularly suitable are those which contain an .a'mido-aryl residue adapted to be diazotized, such as amido benzoyl amidonaph- 'tholsulfonic aclds or amidoaryl-1:2-naphthimidazole-5-oxyJZ-sulfonic acids.

'What I claim is:

a 1. The herein described process for the manufacture of orange to red,tetrazo-dyestufls, which consists in combining one molecule of the tetrazo-deriyative of a diaminbf the general formula:

X/VRNHZ RL-Nn with two molecules of azo-dye-components, one at least of which is a molecule of an amidoaryl-S-pyrazolone-derivative.

2. As new products, the tetrazo-dyestufli's which are obtained by combination of one molecule of the tetrazo-derivat-ive. of a diamin of the general formula R NH with two molecules of an azo-dye-compo nent, one at least of which is a molecule of an amidoaryl-5-pyrazolone-derivative, forming in dry state brownish-yellow to brown powders soluble in water with orange to red coloration and dyeing unmordanted cotton orange-yellow to orange-red shades which, when beta-naphthol, yield Valuable orange to red tints fast to washing.

In witness whereof I have hereunto signed my name this 25th day of June 1909, in the presence of two subscribing witnesses.

ARNOLD SGHEDLER.

Witnesses:

GEORGE GIFFORD, AMAND BRAUN.

further diazotized and developed with 

